Montrose Environmental Group

Montrose Environmental Group, Inc., commonly known as Montrose, is an American environmental-services company serving public agencies, industrial businesses, utilities, infrastructure operators, and other private-sector organizations. The company operates as a vertically integrated platform: rather than concentrating on one environmental specialty, it combines laboratory analysis, field measurement, regulatory consulting, engineering, remediation, and technology-enabled treatment services. Its work covers air, water, soil, hazardous materials, pollution prevention, environmental permitting, compliance programs, and emerging contaminants such as per- and polyfluoroalkyl substances (PFAS). Montrose was founded in 2012 and expanded through a collection of specialist businesses and acquisitions. Oaktree Capital Management invested in the company in 2018, supporting its growth as a consolidated environmental-services platform. Montrose became a public company in July 2020, when its shares began trading on the New York Stock Exchange under the ticker MEG. In 2021, the company relocated its corporate headquarters from Irvine, California, to Little Rock, Arkansas, while retaining a broad operating footprint across North America and other international markets. The company’s operating model brings together more than 35 subsidiaries and specialist practices. These include laboratory and analytical organizations such as Enthalpy Analytical, Vista Analytical Laboratory, Frontier Analytical Laboratories, and Air, Water and Soil Laboratories; environmental consulting and engineering businesses such as Matrix Solutions, Advanced GeoServices, and Spirit Environmental; and emergency-response and toxicology organizations including the Center for Toxicology and Environmental Health, or CTEH. Emerging Compounds Treatment Technologies, known as ECT2, provides treatment systems for contaminated water, including PFAS removal technologies and mobile or deployable filtration vessels. Montrose’s customers include municipalities, utilities, manufacturers, energy companies, transportation organizations, infrastructure owners, and U.S. federal agencies. By 2024, the company reported support for more than 13 federal agencies, including the Army, Air Force, Navy, Coast Guard, Environmental Protection Agency, Department of Veterans Affairs, Food and Drug Administration, National Park Service, National Oceanic and Atmospheric Administration, Centers for Disease Control and Prevention, Bureau of Land Management, National Institutes of Health, and U.S. Fish and Wildlife Service. Its work for public-sector customers has included air and water-quality programs, hazardous-waste management, PFAS investigations, pollution prevention, environmental permitting, and regulatory compliance. The company has also been involved in high-profile incident-response assignments. After the 2023 East Palestine, Ohio, train derailment, Montrose subsidiary CTEH was hired by Norfolk Southern to help develop indoor-air testing procedures, operate a resident hotline, coordinate with the EPA, and publish an air-sampling and analysis plan. CTEH separately provided air-monitoring support after a major fire at Miami-Dade County’s waste-to-energy facility. Montrose businesses have also supported PFAS testing for municipalities and deployed water-treatment vessels at hundreds of sites, including installations associated with Pease Air National Guard Base. Montrose’s analytical and consulting work extends beyond emergency response. Its specialists have participated in air-monitoring guidance development for the Colorado Department of Public Health and Environment and have appeared at EPA air-monitoring conferences. The company has also worked with organizations subject to the California Environmental Quality Act and has stated that its sustainability objectives are aligned with the United Nations Sustainable Development Goals. As of the company information summarized in the reference material, Montrose had more than 3,500 employees and over 90 offices in the United States, Canada, Europe, and Australia. Its positioning is that of a full-service environmental partner capable of handling an issue across the project lifecycle, from sampling and laboratory analysis through permitting, engineering, treatment, remediation, and long-term compliance. Its scale and breadth distinguish it from narrowly focused testing laboratories or individual environmental consultancies, although the company’s decentralized subsidiary structure preserves specialized technical capabilities.

Montrose Environmental Group was established in 2012 as an environmental-services business designed to bring together complementary technical disciplines. Its platform approach differs from a single-service laboratory or engineering consultancy: Montrose combines analytical testing, field measurement, permitting, compliance advice, engineering, remediation, and specialized treatment technologies. This structure allows it to support projects from initial investigation through corrective action and continuing regulatory obligations. A significant stage in the company’s development came in 2018, when Oaktree Capital Management invested in Montrose. The investment supported the company’s expansion and the assembly of a larger network of environmental businesses. Montrose subsequently continued to build its capabilities through specialist subsidiaries covering laboratory science, water treatment, air monitoring, toxicology, environmental consulting, and remediation. In 2019, subsidiary Enthalpy Analytical conducted PFAS water testing for the town of Maysville in Jones County, North Carolina, and had performed related work for other municipalities and public agencies, including Pender County. Enthalpy also contributed to scientific research examining differences between tobacco-derived and synthetic nicotine products. The company’s PFAS activities formed part of a broader Montrose focus on emerging contaminants and difficult-to-treat water pollution. By 2020, ECT2 filtration and PFAS-removal vessels had been deployed at more than 350 sites worldwide. The business supported water-treatment programs for municipalities including Portsmouth, New Hampshire, and the Anson-Madison Sanitary District. ECT2 also deployed a patented resin-based treatment system at Pease Air National Guard Base, where the system treated tens of millions of gallons of contaminated water. These activities helped establish water treatment and PFAS response as important parts of Montrose’s service offering. Montrose became publicly traded in July 2020, with its shares listed on the New York Stock Exchange under the symbol MEG. Public-market status provided a new framework for financing and reporting while the company continued to operate through a group of specialized subsidiaries. In 2021, Montrose moved its corporate headquarters from Irvine, California, to Little Rock, Arkansas. Arkansas state officials publicly welcomed the relocation and presented it as an addition to the state’s business and technical-services community. The company’s work expanded across both routine compliance and high-consequence environmental incidents. Montrose businesses provided air measurement, laboratory analysis, environmental permitting, engineering, remediation, and regulatory support for industrial and public-sector clients. The company also developed relationships with federal agencies and, by 2024, reported supporting more than 13 U.S. federal departments and agencies. Its federal assignments covered environmental quality, hazardous waste, pollution prevention, PFAS, and related technical requirements. In June 2022, Montrose was the target of a sophisticated ransomware attack that affected computers and servers within the Enthalpy Analytical laboratory network. The incident illustrated the operational and data-security risks associated with laboratory and analytical businesses, although the available reference material does not provide detailed information about the duration, financial impact, or final resolution of the event. Montrose and its subsidiaries were involved in several prominent response and monitoring projects in 2023. CTEH worked for Norfolk Southern after the East Palestine train derailment, helping develop indoor-air testing protocols, operate a hotline for residents, coordinate with the EPA, and publish an air-sampling and analysis plan. CTEH also conducted air monitoring for Miami-Dade County after a major fire at the county waste-to-energy facility. Separately, Montrose representatives served on a technical panel supporting improved air-monitoring guidance for the Colorado Department of Public Health and Environment and participated in the EPA National Ambient Air Monitoring Conference. The same year brought a major tragedy for CTEH. On February 22, 2023, a Beechcraft Super King Air carrying five CTEH employees crashed near a 3M plant while the employees were traveling to investigate an explosion at a metal factory in Bedford, Ohio. All five people aboard were killed. The event was associated with the risks of specialized emergency-response work but was not described in the reference material as a corporate misconduct finding. Montrose has also undertaken environmental compliance work in California, including assistance to organizations and companies seeking to maintain compliance with the California Environmental Quality Act. The company has stated sustainability objectives aligned with the United Nations Sustainable Development Goals. In October 2024, Montrose received a five-year, $249 million environmental-support contract from the U.S. Army Corps of Engineers’ Mobile District, South Atlantic Division. The assignment includes air and water quality, PFAS, pollution prevention, and hazardous-waste support. By 2024, Montrose had more than 3,500 employees, over 90 offices, and operations spanning the United States, Canada, Europe, and Australia. Its subsidiary network included more than 35 businesses. The company’s present identity is therefore that of a scaled environmental-services group that preserves specialist laboratory and consulting brands while offering public and private customers a broad, integrated response to environmental measurement, compliance, contamination, and remediation needs.

• 2024

  Montrose wins Army Corps environmental-support contract

  [1]Montrose Environmental Groupen.wikipedia.org

  Montrose receives a five-year contract supporting the Mobile District and South Atlantic Division on environmental matters.

• 2023

  CTEH supports East Palestine response

  [1]Montrose Environmental Groupen.wikipedia.org

  CTEH provides air-testing, hotline, and analytical-plan support after the East Palestine train derailment.

• 2022

  Ransomware attack affects Enthalpy systems

  [1]Montrose Environmental Groupen.wikipedia.org

  A sophisticated ransomware attack impacts computers and servers in the Enthalpy Analytical laboratory network.

• 2021

  Corporate headquarters move to Little Rock

  [1]Montrose Environmental Groupen.wikipedia.org

  Montrose relocates its headquarters from Irvine, California, to Little Rock, Arkansas.

• 2020

  Montrose lists on the New York Stock Exchange

  [1]Montrose Environmental Groupen.wikipedia.org

  Montrose begins public trading on the NYSE under the ticker MEG.

• 2020

  ECT2 reaches more than 350 water-treatment deployments

  [1]Montrose Environmental Groupen.wikipedia.org

  ECT2 filtration and PFAS-removal vessels have been deployed at more than 350 sites worldwide.

• 2019

  Enthalpy Analytical conducts municipal PFAS testing

  [1]Montrose Environmental Groupen.wikipedia.org

  Enthalpy Analytical performs PFAS water testing for Maysville, North Carolina, and other public-sector customers.

• 2018

  Oaktree Capital Management invests in Montrose

  [1]Montrose Environmental Groupen.wikipedia.org

  Oaktree Capital Management provides investment supporting Montrose’s platform expansion.

• 2012

  Montrose Environmental Group is founded

  [1]Montrose Environmental Groupen.wikipedia.org

  Montrose is established as an environmental-services company.

A vertically integrated, multinational environmental-services platform combining specialist laboratories, field monitoring, consulting, engineering, treatment, remediation, and emergency response for government and commercial customers.

• Analytical services

  Environmental laboratory testing

  Montrose operates and manages specialist laboratories that analyze air, water, soil, industrial materials, and emerging contaminants. These services support regulatory compliance, site investigations, public-health assessments, remediation decisions, and emergency response. The group’s laboratory businesses include Enthalpy Analytical, Vista Analytical Laboratory, Frontier Analytical Laboratories, Air, Water and Soil Laboratories, and other specialist entities.

• Water-treatment technology

  ECT2 water treatment and PFAS removal

  ECT2 provides deployable water-filtration and treatment systems for contaminated sites and municipal or industrial customers. Its capabilities include PFAS removal and resin-based treatment technologies. ECT2 vessels had been deployed at more than 350 sites by 2020, including systems used at Pease Air National Guard Base and by municipalities seeking to treat contaminated water.

• Environmental monitoring

  Air-quality measurement and monitoring

  Montrose provides air measurement, emissions monitoring, ambient-air programs, sampling design, laboratory analysis, and related technical support. These services are used for regulatory programs, industrial operations, emergency incidents, public-health concerns, and the development of air-monitoring guidance. The company has contributed to technical discussions with Colorado regulators and participated in EPA air-monitoring forums.

• Consulting and regulatory services

  Environmental compliance and permitting

  Montrose advises organizations on environmental permits, regulatory obligations, pollution prevention, hazardous-waste requirements, and environmental review. Its California work has included assistance with California Environmental Quality Act compliance. The offering is intended to help clients plan projects, maintain permits, document performance, and respond to changing environmental rules.

• Engineering and remediation

  Remediation and environmental engineering

  Through engineering, consulting, and remediation subsidiaries, Montrose supports the investigation and cleanup of contaminated properties and environmental liabilities. Work can include site characterization, remedial design, treatment selection, construction support, monitoring, and long-term compliance. The group’s broad technical base allows laboratory results and field data to be connected to engineering and corrective-action programs.

• Incident response and risk assessment

  CTEH emergency response and toxicology

  The Center for Toxicology and Environmental Health provides toxicology, industrial hygiene, exposure assessment, incident response, health-risk communication, and environmental monitoring services. CTEH has supported responses to industrial accidents, fires, transportation incidents, and community concerns. Its work after the East Palestine derailment included indoor-air testing design, resident hotline operations, EPA coordination, and publication of an air-sampling plan.

• 2022

  Ransomware attack on the Enthalpy Analytical laboratory network

  Montrose was the victim of a sophisticated ransomware attack affecting computers and servers in Enthalpy Analytical’s laboratory network. The available reference material does not specify the full operational, data, or financial consequences.

  Source

• 2019

  Questions raised about CTEH toxicology reports

  A Grist report alleged that Montrose subsidiary CTEH mishandled or inadequately prepared toxicology reports, including work connected to a chemical explosion in Houston. One toxicologist characterized the work negatively. The available reference material reports allegations rather than a confirmed regulatory or judicial finding.

  Source

Read more

• 2023East Palestine environmental-response program

  United States

  CTEH was hired by Norfolk Southern after the East Palestine, Ohio, train derailment to address residents’ concerns about odors, fumes, and possible health effects. Its responsibilities included helping design indoor-air testing, operating a resident hotline, coordinating with the EPA, and publishing an air-sampling and analysis plan.

  Outcome. The assignment positioned Montrose as a technical participant in a highly visible environmental incident, although the available material does not provide a comprehensive assessment of the program’s results.

  Source
• 2023Miami-Dade waste-to-energy facility fire monitoring

  United States

  CTEH was contracted by Miami-Dade County to conduct air monitoring following a major fire at the county’s waste-to-energy facility.

  Outcome. The engagement extended Montrose’s emergency monitoring work into a major municipal fire-response context.

  Source

• 2024

  Army Corps environmental-support contractOther

  Background

  The U.S. Army Corps of Engineers required broad environmental support for its Mobile District and South Atlantic Division.

  Action taken

  Montrose was awarded a five-year contract covering air and water quality, PFAS, pollution prevention, hazardous waste, and related environmental services.

  Aftermath

  The award expanded Montrose’s federal-agency work and demonstrated the value of its integrated environmental-services model.

  Contract value. $249 million (Five-year contract awarded in October 2024)

  Source

• 2021

  Headquarters relocation to Little RockStrategy

  Background

  Montrose sought to establish its corporate headquarters in a different U.S. business and talent market while maintaining its distributed operating network.

  Action taken

  The company moved its headquarters from Irvine, California, to Little Rock, Arkansas.

  Aftermath

  Montrose retained its multinational office network and continued expanding its public-sector and technical-services activities.

  Source

• 2020

  Public listing on the New York Stock ExchangeStrategy

  Background

  After years of expansion as an environmental-services platform, Montrose pursued public-market access.

  Action taken

  The company began trading on the NYSE under the ticker MEG in July 2020.

  Aftermath

  The listing established Montrose as a publicly traded environmental-services group and supported continued visibility and expansion.

  Source

1. 1Montrose Environmental Groupen.wikipedia.org